Ink supply bag



FIG. 1 is a perspective view of an ink supply bag showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a side elevation view thereof; and,

FIG. 7 is an elevation view of the opposite side thereof. 

The ornamental design for an ink supply bag, as shown and described. 